Force, a push or pull that changes the motion of objects, Contact Force, A force that acts on an object when in direct contact, Noncontact Force, A force that acts on an object without direct contact., Gravity, A non-contact force that pulls objects with mass towards each other, Magnetism, The size or strength of a force, Friction, a contact force that works against other forces, Normal Force, the support force a surface pushes back on an object with., Mass and Distance, The gravitational force is affected by, Applied force, when a force is acted upon an object

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